Parsers and serialisers

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• @yankeeinlondon/gray-matterParse front-matter from a string or file. Fast, reliable and easy to use. Parses YAML front matter by default, but also has support for YAML, JSON, TOML or Coffee Front-Matter, with options to set custom delimiters. Used by metalsmith, assemble, verb and
• editorjs-parserConvert editor.js saved output into clean HTML — zero runtime dependencies
• mdpdfMarkdown to PDF command line converter
• @yankeeinlondon/builder-apiAn API used to extend the capabilities of @antfu/vite-plugin-md
• gulp-jsonminifyMinifies blocks of JSON-like content into valid JSON by removing all whitespace and comments.
• @nolebase/vitepress-plugin-enhanced-readabilitiesA VitePress plugin enhances the readabilities for VitePress built sites.
• @mdx-js/mdxastTransforms MDAST to MDXAST
• @jsonjoy.com/json-typeHigh-performance JSON Pointer implementation
• @shogobg/markdown2confluenceConvert Markdown to Confluence markup
• nimnjsSchema aware compression of JS object/JSON data. 60% more compressed than json
• seqparseParse sequence files (GenBank, FASTA, SnapGene, SBOL) and accession IDs (NCBI, iGEM) to a common format
• @mitre/jsonixJsonix (JSON interfaces for XML) is a JavaScript library which allows converting between XML and JSON structures.
• domparser-darwin-arm64A super fast html parser and manipulator written in rust.
• nodebb-widget-essentialsNodeBB Essential Widgets
• any-eslint-parserCheck Any file with ESLint
• nimn_schema_builderBuild schema from JS object or JSON to feed into nimnjs
• @remnic/plugin-codexRemnic memory plugin for Codex CLI — hooks, skills, MCP integration
• jsonformClient-side JavaScript library that generates HTML forms from structured data models expressed using a JSON schema, possibly completed by a form layout description.
• parjsLibrary for building parsers using combinators.
• regexp-parser-event正規表達式解析器事件處理 (RegExp parser event handling)
• hadsFast web server allowing to browse, search and edit project documentation written in Markdown
• vitepress-plugin-lightboxPlugin for VitePress to add support for viewing images in a lightbox.
• gulp-json-concat⚡️ Combine several JSON files into one with Gulp
• regexpp2Regular expression parser for ECMAScript 2018.
• @desertnet/html-parserHTML parser and non-strict validator
• @ziloen/remark-mathRemark plugin to parse and stringify math with dollar and LaTeX delimiters
• @microflash/remark-callout-directivesRemark plugin to render callouts with directives
• pg-astPostgreSQL ASTs in JS
• vuetify-pro-tiptaptiptap text editor on vuejs and vuetify
• latex.jsJavaScript LaTeX to HTML5 translator
• lcov-totalParsing lcov.info and returning total of the summary intended to use inside CI to exit if threshold not reach
• streamdown-svelte<p align="center"> <img src="https://raw.githubusercontent.com/PacificStudio/streamdown-svelte/master/static/favicon.svg" alt="Streamdown Svelte favicon" width="96" height="96" /> </p>
• @remnic/import-chatgptImport memory and conversation summaries from ChatGPT data exports into Remnic (issue #568)
• @nesto-software/json-schema-ref-parserParse, Resolve, and Dereference JSON Schema $ref pointers
• rich-markdown-editorA rich text editor with Markdown shortcuts
• sqlite-parserJavaScript implentation of SQLite 3 query parser
• swagger-markdownCreate markdown API documentation from swagger file
• @remnic/import-claudeImport conversation history from Claude.ai data exports into Remnic (issue #568)
• @webdoc/language-parserLanguage parser for webdoc
• @comark/svelteSvelte 5 renderer for Comark. Render Markdown with components at runtime, with streaming support for AI output.
• remark-gfm-configurableremark plugin to support GFM (autolink literals, footnotes, strikethrough, tables, tasklists) with configurable plugin options
• @spryker/sql-parser-misticLexer and Parser for SQL Syntax
• console-log-jsonDrop-in structured JSON logging for Node.js and the browser. Zero dependencies. Replaces console.log() with single-line JSON output including stack traces, timestamps, and source file tracking. Works with DataDog, Splunk, LogDNA, OpenSearch, CloudWatch, a
• xmldom-tsA W3C Standard XML DOM(Level2 CORE) implementation and parser(DOMParser/XMLSerializer) in Typescript.
• flatfile-csv-importerA simple adapter for elegantly importing CSV files via flatfile.io (Typescript, ES6, Browser)
• gitleaks-secret-scanner-fixedA powerful, intelligent wrapper for the Gitleaks engine that provides accurate and safe secret scanning for local pre-commit hooks and CI/CD pipelines. Fork with fixed tar vulnerability.
• markstream-reactReact/Next.js streaming Markdown renderer for AI chat, LLM token streams, SSE/WebSocket output, incomplete Markdown, long documents, Mermaid, KaTeX, stream-diffs powered code blocks, and custom React components.
• domparser-linux-arm64-gnuA super fast html parser and manipulator written in rust.
• markdown-it-textual-umlMarkdown-it markdown parser plugin to create uml diagrams from text, based on plantuml, mermaid, etc.
• openapi-markdownCreate markdown API documentation from swagger/openapi files

• htmlparser2 vs cssom
• css-tree vs lightningcss
• esprima vs meriyah
• markdown-it vs markdown-exit
• turndown vs showdown
• @mdxeditor/editor vs @uiw/react-md-editor
• markdownlint-cli2 vs markdownlint-cli
• @mdx-js/react vs @mdxeditor/editor
• @uiw/react-md-editor vs markdown-exit
• @uiw/react-md-editor vs easymde
• @mdxeditor/editor vs easymde
• react-markdown vs @mdx-js/react
• @mdx-js/react vs markdown-to-jsx
• defuddle vs md-to-pdf
• pino vs roarr
• cheerio vs html-react-parser
• htmlparser2 vs html-react-parser
• react-markdown vs markdown-to-jsx
• @mdxeditor/editor vs react-native-enriched-markdown
• @microsoft/tsdoc vs jsdoc-to-markdown
• markdown-exit vs snarkdown
• doctoc vs jsdoc-to-markdown
• react-markdown vs @mdxeditor/editor
• snarkdown vs @tryfabric/martian
• turndown vs snarkdown
• conf vs convict
• markdown-it vs turndown
• xlsx vs fast-formula-parser
• json-schema-to-ts vs prisma-json-types-generator
• @microsoft/tsdoc vs vue-docgen-api